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Ethernet Passive Optical Network (EPON) is one of the most promising technologies for FTTX deployed by service providers at the access network. Dynamic Bandwidth Allocation (DBA) for the upstream traffic can help optimize the network bandwidth utilization. This paper discusses a centralized DBA called as Universal DBA (UDBA) algorithm that supports quality of service (QoS) of the upstream traffic...
We consider the problem of placing virtual clusters, each consisting of a set of heterogeneous virtual machines (VM) with some interrelationships due to communication needs and other dependability-induced constraints, onto physical machines (PM) in a large data center. The placement of such constrained, networked virtual clusters, including compute, storage, and networking resources is challenging...
Machine Type Communication (MTC), which allows different devices to communicate without the needs of human to machine interactions, has been developed in recent years. However, MTC possibly resulting in an unexpectedly high collision rate is different from contemporary mobile communication service when it involves a very large number of communication terminals with little traffic requirement. As a...
In this paper, we propose photonic crystal waveguide structure to attain enhanced slow light performances by carrying out various optimizations on a regular triangular lattice photonic crystal. While residing at a moderate slow down factor (group index), the investigated structure provides a very large delay bandwidth product factor. This value outperforms the previously declared numbers available...
Weighted fair queuing (WFQ) allows Internet operators to define traffic classes and then assign different bandwidth proportions to these classes. Unfortunately, the complexity of efficiently allocating the buffer space to each traffic class turns out to be overwhelming, leading most operators to vastly overprovision buffering—resulting in a large resource footprint. A single buffer for all traffic...
Space information networks promise encouraging prospects in areas of detection, communication and location. In this paper, node and link evaluation algorithms are proposed to provide reconfiguration basis for such networks. Given that space information networks operate in multi-application environments and offer diverse services, we take connectivity and availability into comprehensive consideration...
IEEE 802.11e Enhanced Distributed Channel Access (EDCA) is developed to provide Wireless Local Area Networks (WLANs) with Quality of Service (QoS) support. Several solutions have been proposed in order to provide a fair channel access for all competing stations. This paper first studies the QoS capabilities of the Adaptive Weighted and Prioritized Polling (AWPP) protocol that adopts the frame structure...
In order to support efficiently Voice over IP (VoIP) traffic using semi-persistent scheduling in the Long-Term Evolution (LTE) uplink, frequency hopping (FH) should be applied to obtain a frequency diversity gain. In addition, subframe bundling (SFB) is also effective for improving the received signal quality of users in the vicinity of the cell edge. However, since a resource block (RB) allocation...
Statistical multiplexing aims at transmitting several variable bit rate (VBR) encoded video streams over a bandlimited channel. Rate-distortion (RD) models for the encoded streams are often used to control the video encoders. As discrepancies frequently occur between the actual RD characteristics and their models, buffers are placed at the output of each coder to facilitate regulation. In this paper,...
Using UWB for wireless short range, low rate communication is attracting growing interest due to its low power consumption and very high bandwidth. Moreover, it is able to offer accurate localization in the range of few centimeters. Regarding these qualities, it is desirable to design a IR-UWB transceiver which consumes as few power as possible when it is applied for battery driven wireless sensors...
This paper introduces a hierarchical trick play mechanism for video streaming. Trick level concept is introduced to support multiple trick rates, reduce delay when switching from high to low rate and minimize network bandwidth usage. Dedicated trick play streams on server side are created to improve user experience and reduces client processing requirement. It is efficient and easy to implementation.
The ever-increasing importance of main memory latency and bandwidth is pushing CMPs towards caches with higher capacity and associativity. Associativity is typically improved by increasing the number of ways. This reduces conflict misses, but increases hit latency and energy, placing a stringent trade-off on cache design. We present the zcache, a cache design that allows much higher associativity...
Load balancing is a key component of P2P network. In this paper, we present a new load balancing scheme for Chord system, called dynamic group-based duplications scheme (DGDS). Firstly, we divide Chord ring into several continuous groups, in which light-loaded peers share the load of overloaded peers. Secondly, DGDS computes out how many duplications are required to lighten the load of overloaded...
Network coding is known to provide increased throughput and reduced delay for communications over networks. In this paper we propose a peer-to-peer video streaming system that exploits network coding in order to achieve low start-up delay, high streaming rate, and high resiliency to peers' dynamics. In particular, we introduce the concept of random multicast trees as overlay topology. This topology...
In this paper, we extends bandwidth balancing technique in wired networks to operate in mobile ad hoc networks (MANETs). In bandwidth balancing in Distributed-Queue-Dual-Bus (DQDB), different nodes occupy the same channel, and information about the bandwidth is transferred between nodes in the unused bandwidth. Similarly, in wireless networks, the capacity on a channel is shared by several sources...
In this work, we investigate secret key generation from channel states. We point out, by means of a packet-delay-based attack, that observing its own channel states is not the only way an adversary can learn about the channel states of the legitimate communicating parties. The attack suggests that it is not secure to transmit data via the channel whose states generate secret keys. However, not using...
In Distributed WiMAX Mesh Networks (DWMN), a joint solution with FEBA (Fair End-to-end Bandwidth Allocation) and DRR (Deficit Round Robin) can be used to achieve high end-to-end throughput fairness. Even then, the higher the number of hops a traffic flow traverses, the longer becomes the end-to-end delay of the traffic flow. This will result in serious unfairness of service quality among real-time...
In high-speed and long-distance networks, TCP NewReno, which is the most popular version of TCP, cannot achieve sufficient throughput because of the essential nature of the congestion control mechanism of TCP. Therefore, Compound TCP has been proposed. Compound TCP can achieve a considerably larger throughput than TCP NewReno in high-speed and long-distance networks. The congestion control mechanism...
We extend and relax the concept of tree-farm previously implicitly introduced for the design of the multicast protocol SplitStream. Our extension enables the tree-farm concept to be applied to non vertex-symmetric overlay networks. In particular, we demonstrate that, in the case of the de Bruijn overlay network used in P2P systems such as Koorde and D2B, our relaxed notion of tree-farm achieves higher...
TCP is the main and most widely used transport protocol for reliable communication. Because of its widespread need, researchers have been studying and proposing new TCP variants trying to improve its behavior towards congestion to make it use the most available bandwidth while preserving a logical level of fairness towards other protocols. This paper aims at evaluating and comparing the performance...
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